Grinding machine



Aug. 29, 1933. G. w. BINNS 1,924,593

GRINDING IIAQHINE Filed Dec. 51. 1951. I 2 Sheets-Sheet 1' G. w. BINNS1,924,593 GRINDING MACHINE l Filed Dec. 31. 1931 2 Sheets-Sheet 2 Pat ented Aug. 29, 1933 PATENT OFFICE 1,924,593 v GRINDING mom George W.Binns, Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated,Cincinnati, Ohio, a corporation of Ohio Application December 31, 1931Serial No. 584,174

18 Claims. (01. 51-403) This invention relates to improvements inmachine tools andespecially to improvements in grinding machines.

An object of the invention is the provision o a centerless grinderparticularly adapted for the grinding of multiple diameter work pieces.

Another object'of the invention is the provision of a centerless grinderfor frictionallycontrolling the rotation of a work piece of multiplediameter while the said diameters are being simultaneously ground orfinished.

A further object of the invention is the provision of an improvedmechanism for use with a centerless grinder for frictionally engagingand controlling the rotation of a work piece having several diameterswhereby the said work is rotated at the same speed regardless of whichdiameter is being used as the controllant.

Other objects and advantages of the present invention should be readilyapparent by reference to the accompanying drawings illustrating theinvention described in the accompanying specification and it is to beunderstood that any modifications may be made in the exact structuraldetails there shown and described within the scope of the appendedclaims without departing from or exceeding the spirit of the invention.

In the drawings:

Figure 1 is a front elevation of a centerless grinder embodying thepresent invention.

Figure 2 is a top plan view of the machine illustrated in Figure 1.

Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Figure 4 is a sectional view taken on line 44 of Figure 3.

Throughout the several views of the drawings similar referencecharacters are employed to denote the same or similar parts.

Centerless grinders employing opposed grinding and regulating wheels anda work rest there between have been known in the past, as well ascenterless grinders having contoured grinding wheels for simultaneouslygrinding two or more different diameters on the work piece while beingcontrolled by a regulating wheel. These machines, however, have employedbut a single regulating wheel which contacted with but one of theseveral diameters for controlling the rate of rotation of the work. Incases where the several diameters are spaced from one another and wherea great difierence in diameters exists, difli culty has been encounteredbecause of a tendency oi the work not backed up to spring. In anendeavor to overcome this difficulty, a plurality of regulating wheelshas been provided, one for contacting with each diameter being ground,which wheels were driven at the same speed. It has been found, however,that work pieces irequently 'have an irregular amount of excessive stockthereon, so that, certain work pieces are initially engaged andcontrolled by the larger portion thereof which efiects the rotation ofthe work at a speed depending upon the ratio of the diameter of thewheel to the work, while other work pieces are initially engaged andcontrolled through the engagement of the second wheel with a smallerdiameter of the work, so that the work piece is thereby rotated at avery high rate of speed. Since the two wheels were driven at the samespeed and in view of .working conditions due tothe size of the work asabove described, the speed of the work greatly varied so that it wasimpossible to properly finish work pieces by the centerless method withtwo difierent diameter regulating wheels rotating at a con stant speed.This difliculty was overcome by providing two regulating wheels ofdifierent diameters and contacting simultaneously with the differentdiameters of the work which are rotated at diiierent speeds which willeffect the rotation of the work at the same speed regardless of which ofthe wheels is efl'ecting or controlling the speed of rotation ofthework.

A machine for accomplishing this result may comprise a bed 10 havingformed on its-upper surface ways 11 for a slide 12 which is-shiftablerelative to the bed longitudinally thereof. Mounted on the slide 12 is asecond slide 13 bearing a bracket 14 for a head 15 in which is mounted aspindle 16. The spindle 16 is rotated from any suitable power source,preferably a motor or prime ,mover 160, which drives through a gear box,in-

dicated generally 'by the'numeral 1'7, and a chain or flexible belt 18.The bed 10 further has rising from it a pedestal bearing 19 in which isjournaled a spindle 20 having secured thereto the grind-wheels 21 and22. The wheels 21 and 22 are respectively adapted to operate upon andgrind the larger diameter 23 and smaller diameter 24 of a work piece 25.The work piece 25 is mounted in a grinding throat formed adjacent thegrinding wheel and is supported by a work rest blade 26 secured to ablock 27 adjustably carried by the rear end of the lower slide 12. Thegrinding throat is defined on one side by the grinding wheels 21 and 22and on the other side by opposed regulating wheels 23 and 29 which arerotated at difierent speeds for properly frictionsleeve 41.

ally engaging and controlling the rotation of the work 25.

The upper and lower slides 13 and 12 are adepted to be shifted relativeto one another for setup purposes and the like and shifted as a unittoward and from the grinding wheels to feed the work piece i'ntosaidwheels and effect a stock removal therefrom. To this end the lower slide12 carries clamps 67 for securing same to the bed whereupon the upperslide is shifted relative there- ,to, while the upper slide carries aclamp 68 for securing the slides to one another so that upon looseningof the clamps 67 the two slides may be moved as a unit. A swivel nut 69is journaled in the rear wall of the bracket 14 but held againstrelative axial movement therewith. An adjusting screw '70 has a threadedengagement with the nut on one end and has its other end journaled in abracket '71 secured to an extension 72 of the bed 10. A pilot or handwheel '73 is secured to the screw '70 beyond the bracket 71 whereby thescrew is actuated. In actual operation use is made of a lever '74secured in any desirable manner to the nut 69, for effecting itsoscillation, for actuating the slides toward and from' determined by thegear box 1'7 which rotates the spindle 16 and the regulating wheel 28secured thereto. This wheel 28 contacts with the larger diameter 23 ofthe work piece and will rotate at a given speed depending upon thedesired speed of rotation of the work, since the speed of rotation ofthe work is directly dependent on the speed of rotation of itscontrolling or speed regulating wheel. Since the regulating wheel 29contacts with the smaller diameter portion 24 of the work it will rotateat a much slower speed than the wheel 28 so that it will effect therotation of the work thereby at the same speed as the wheel 28. I

To this end a collet nut 32 which secures'the collet 33 of theregulating wheel 28 to the tapered nose 34 of the spindle 16 is providedwith an extension 35 having a transverse slot 36 formed therein. The nut32 is further formed with a perforation 37 receiving the inner end 3801' a shaft 40 which is journaled in a sleeve 41. The

said inner end 38 of the shaft 40 carries a pin 39 which is received inthe nut transverse 'slot 36 and effects a driving connection. betweenthe spindle and shaft 40. The shaft 40 on its other end has a reducedextension 42 which is rotatably mounted in a bearing 43 carried by acover plate 44 secured to a bracket or housing 45. The housing 45 issecured to the head 15 by meansof a connecting bar or tie 46 which hasitsv opposite ends respectively secured to the housing 45 and head 15.The shaft extension 42 has secured to it a pinion 4'7 which meshes witha gear 48of compound gear 49 loosely journaled on a stub shaft 50,journaled at opposite ends in the cover plate 44 and housing 45. Asecond gear 51, of

the compound gear 49, meshes with a gear 52- keyed or otherwise securedto the end of the This sleeve 41 is mounted .in antifriction bearings-53 carried by the housing 45. The other end ofthe sleeve 41 is enlargedas at 54 to form a wheel collet and also encircles the collet nut 32.The enlarged or collet portion 54 of the sleeve 41 forms a mounting forthe regulating wheel '29 which is secured thereto in any suitable ordesirable manner, such as by the nut It will be noted that the ratiobetween the pinion 4'7 and gear 48 and between the pinion 51 and gear 52is such as to materially reduce the speed of the regulating wheel 29 ascompared to the speed of the wheel 28. As shown in the drawings, thisreduction is nearly 4 to 1, but it is to be understood that by changingthe gears or the ratio thereof, this speed differentiation may beincreased or'decr'eased depending upon the difference between thediameters of the work to be ground. From the foregoing, it will be notedthat regardless of the size of the different portions of the work, itwill be rotated at the same speed no matter which of the diameters is indriving contact with its regulating. wheel.

In order to true the active faces of these wheels, and especially whenthey are made of abrasive material, it is necessary that they be rotatedat substantially the same high speed. For this reason the shaftextension 42 has splined to it, between the pinion 4'7 and sleeve 41, asliding twofaced clutch 56, having on one face thereof the clutch teeth57 and on the other face clutch teeth 58. llutch teeth 5'7 are adaptedto be meshed with complementary clutch teeth 59 projecting from theadjacent face of the pinion 4'7, while .the clutch teeth 58 mesh withcomplementary teeth 60 projecting from the adjacent face of the gear 52.

From this it will be seen that with the clutch 56 in the positionillustrated in Figure 3 the drive to the regulating wheel 29 will bethrough the back gear 49 while if the clutch teeth 58 and 60 wereintermeshed, a direct coupling between the shaft 40 and sleeve 41 wouldbe established so that a one to one ratio would ,exist between thewheels 28 and 29, thereby rotating said wheels at the'same speed. s

In order to shift the clutch 56; it is provided with a circumferentialgroove, 61 receiving the arms 62 of a shifter fork 63 which is carriedby I crank 64 secured to the inner end of a shaft 65.

This shaft 65 is journaled in the upper wall of the bracket or'housing45 projecting there beyond and has secured thereto a handle or lever 66.

It will be readily perceived that oscillation of this lever 66 in one orthe other direction will correspondingly oscillate the crank 64 andthereby shift the clutch member 56. 7

From the foregoing it will be noted that there has been provided acenterless grinding machine adapted primarily for the proper control andfinishing of multiple diameter work pieces and eliminating thepossibility of excessively rotating each portion of the work piecerotatably mounted on the bed, a regulating wheel opposed to eachgrinding wheel, the said grinding and regulating wheels forming agrinding throat between them, a work support within the grindingthroatfor supporting a work piece in simultaneous engagement with thesaid wheels, and means for rotating each pair of opposed wheels atdifferent relative speeds whereby the work piece is rotated at the samespeed regardless of which-work diameter and regulating wheel iseffecting the control.

2. In a grinding machine of the class described for grinding multiplediameter workpieces the combination of a grinding wheel, a frictioncontrol wheel for each diameter of the work, means l for supporting thework in engagement with the wheels, and means for rotating the frictioncontrol wheels at different speeds, the ratio between the speeds of theseveral wheels being equal to the whereby the work is rotated at thesame speed regardless of which control wheel is operating. 3. In agrinding machine of the class described for grinding multiple diameterwork pieces the combination of a grinding wheel, a friction controlwheel for each diameter of the work, means for supporting the work inengagement with the wheels, means for rotating the friction controlwheels at diilerent speeds, the ratio between thespeeds of the severalwheels being equal to the ratio between the several diameters of thework whereby the work is rotated at the same speed regardless of whichcontrol wheel'is operating. and means for connecting the two wheels forrotation at the same speed.

4. In a grinding machine of the class described the combination of awork support adapted to support a multiple diameter work piece, agrinding wheel on one side of the support for engagement with the work,a work control wheel on the other side of the support for contact withone diameter of the work, a separate spindle for the grinding wheel andregulating wheel, a second regulating wheel for engagement with adifferent diameter of the work, a sleeve supporting the second wheel,and a transmission between the spindle and sleeve whereby they aredriven at different speeds depending on the ratio between the difierentdiameters of the work.

5. In a grinding machine of the class described the combination of awork support adapted to support a multiple diameter work piece, agrinding wheel on one side of the support for engagement with the work,a work control wheel on the other side of the support for contact withone diameter of the work, a separate spindle for the grinding wheel andregulating wheel, a second regulating wheel for engagement with adifferent diameter of the work, a sleeve supporting the second wheel, atransmission between the spindle and sleeve whereby they are driven atdifferent speeds depending on the ratio between the different diametersof the work, and a separable connection between the sleeve and spindlewhereby the sleeve may be'driven at the same speed as the spindle forrotating the regulating wheels at the same corresponding speed.

6. In a centerless grinding machine the combination of a bed, opposedgrinding and regulating wheels mounted thereon and forming a grindingthroat therebetween, a work piece support within the grinding throatarranged to support multiple diameter work, a spindle for one of theregulating wheels, a housing therefor, a bracket secured to and carriedby the housing, a support on the bracket'for a second regulating wheel,and a transmission carried by the bracket and connecting the spindle andsecond regulating wheel whereby the second regulating wheel, is rotated.

7. In a centerless grinding machine the combination of a bed, opposedgrinding and regulating wheels mountedthereon and forming a grindingthroat therebetween, a work piece support within the grinding throatarranged to .support multiple diameter work, a spindle for one of theregulating wheels, a housing therefor, a bracket secured to and carriedby. the housing, a support on the bracket for a second regulating wheel,and

a transmission carried by the bracket and connecting the spindle andsecond regulating wheel ratio between the several diameters of the workwhereby the second regulating'wheel is rotated, said transmissionincluding speed reducing members whereby the wheels are rotated atdifferent 8. In a centerless grinding machine the combination of a bed,opposed grinding and regulating wheels mounted thereon and forming agrinding throat therebetween, a work piecesupport within the grindingthroat arranged to support multiple diameter work, aspindle for one ofthe regulating wheels, a.housing therefor, a bracket secured to andcarried by the housing, a support on the bracket for a second regulatingwheel, a transmission carried by the bracket and connecting the spindleand second regulating wheel whereby the second regulating wheel isrotated, said transmission including speed reducing members whereby thewheels are rotated at different speeds, a shlftable clutch in thetransmission, and means on the bracket for shifting the clutch wherebythe spindle is connected through the transmission with the secondregulating wheel or direct therewith for rotating the wheels at aconstant speed.

9. In a centerless grinder for grinding multiple diameter work piecesthe combination with a regulating wheel for eachdiameter of the work, ofmeans for rotating the wheelsat different speeds depending on the ratiobetween the diameters of the work.

10. In a centerless grinder for grinding multiple diameter work piecesthe combination with' a regulating wheel for each diameter of the work,of means for rotating the wheels at different speeds depending on theratio between the diameters of the work, and a single power source foreffecting the rotation of the wheels.

11. In a centerless grinder of the class described for grinding multiplediameter work pieces the combination-with a regulating wheel for eachdiameter of the work, of means for rotatingthe wheels at diflerentialspeeds depending on the ratiobetween the diameters of the work,including a power source for rotating one of the wheels, a separabletransmission between the rotated wheel and remaining wheel, a back gearinthe transmission for reducing the speed of one of the wheels asrespects the other, and means for connecting the wheels with one anotherthrough the back gear and directly.

- 12. Inacenterless grinderof the class described for grinding multiplediameter work pieces the combination with a regulating wheel for eachdiameter of the work, of means for rotating the ing the clutch to eitherof its three positions providing an additional regulating wheelcomprising a bed, a spindle rotatably mounted thereon, means including anut member for securing the wheel to the spindle, a housing for thewheel,

a bracket securable to the housing, a second wheel rotatably carried bythe housing, means carried by the bracket for driving the second wheel,and a connection between the driving means and nut whereby power for thesecond wheel is derived from the nut on the spindle.

14. In a grinding machine the combination of a bed, a spindle rotatablymounted on the bed, a wheel, means securing the wheel to the spindleincluding a'nut member, a housing for the wheel, and an attachment forsupplying a second wheel to be rotated from the spindle of the firstwheel including a bracket romovably secured to the wheel housing, asecond wheel carried by the housing, and transmission means carried, bythe bracket connectible with the spindle and second wheel whereby thesecond wheel is rotated.

15. In a grinding machine the combination of a bed, a spindle rotatablymounted on the bed,

a wheel, means securing the wheel to the spindle to be rotated from thespindle of the first wheel including a bracket removably secured to thewheel housing, a second wheel carried by the housing, transmission meanscarried by the bracket connectible with the spindle and secondwheelwhereby the second wheel is rotated, and a separable connection inthe transmission means for disconnecting said second wheel from thespindle.

16. In a grinding machine the combination of a bed, a spindle rotatablymounted on the 'bed, a wheel, means securing the wheel to the spindleincluding a nut member, a housing for the wheel, and an attachment forsupplying a second wheel to be rotated from the spindle of the firstwheel in cluding a bracket removably secured to the wheel housing, asecond wheel carried by the housing, transmission means carried by thebracket connectible with the spindle and second wheel whereby the secondwheel is rotated, a separable connection in the transmission means fordisconnecting said second wheel from the spindle, and. speed varyingmeans in the transmission whereby the wheel, means securing the wheel tothe. spindle including a nut member, a housing for the wheel, and anattachment for supplying a second wheel to be rotated from the spindleof the first wheel including a bracket removably secured to the wheelhousing, a second wheel carried by the housing,

F transmission means carried by the bracket connectible with the spindleand second wheel whereby the second wheel is rotated, and a separableconnection in the transmission means for disconnecting said second wheelfrom the spindle, comprising a clutch, speed variable means within thehousing operable by the transmisison means, and means for-shifting theclutch to one of three positions for directly connecting the first andsecond wheels for rotating same at the same speed, for indirectlycoupling said wheels through the speed reducing means for differentiallyrotating said wheels, and for disconnecting said wheels from oneanother.

18.' In a grinding machine the combination of a bed, a spindle rotatablymounted on the bed, a

wheel whereby the second wheel is rotated, and a separable connection inthe transmission means for disconnecting said second wheel from thespindle, comprising a clutch, speed variable means within the housingoperable by' the transmission means, and means for shifting the clutchto one of three positions for directly connecting the first and secondwheels for rotating same at the same speed, for indirectly coupling saidwheels through the speed reducing means for difierentially rotating saidwheels, and for disconnecting said wheels from one another, said clutchshifting means being carried by the bracket and accessible I exteriorlythereof including a manually actuable 1 lever.

- GEORGE W. BINNS.

